Piston pin



l Jan. 5 lze. I 1,568,833

n V. J. HARRIS PISTON PIN Filed Oct. l, 1925 '40 a; .ze

I N VEN TOR. lf2/naa '#ar/Zs 1525@ Byuwm-vmj ATTORNEY.

V PatentedfJan. 5, 1926.

@UNITEDsTATEsj vERNoiv .'i; nanars, lor cnnVannini),l oiiio.

- `1 l .V Application` ledctober 1,1925. Serial No.1 59,833.y

To all 'wh-0m maxi/1 @aimerai Be vit yknown thatV I,V ,VERNONl citizen of the` United States, residing nat Cleveland, county of Cuyahoga, State of Ohio, have invented a certainnnew anduseFr ,"ful Improvement in Pistoi'iPins, and r declare the i'ollowing to be `a full, clear, land* exact description ofthe same, such aswill enable others skilledlm the art to which it pertains' to make and use the same, `reference Vbeing had to the accompanying drawings,

l. .lilerent point. i l l v .l Fig. 3 is a vertical sectional view through i my improved pin takenon line 3 3, Fig. 1f Fig. 4 is a perspective of a ymovableend which form a part -ofthis specification.

, My invention relates tov improvements in piston pins and otherpivot bearing'pins of s a similar character; ot" the type provided `with expansible end bea-ring portions.`

Anjobject isto'provide a simple, inexpensive, positively operating pin of the characterfdescribed having.V end v.bearing portions adapted to automatically conform to i an oversize diameter of v the bearings within which such ends; are mounted vinV order to take up for wearand prevent play of the bearing parts.: ,'1. l' l An important useoi my improved pin is in replacement practice in whichit is neces- `thepin. An important .advantager 4in a pin of the sary that the pinso seat'itselfinthebear-- ings as to preventany loose play at ysuch points, and a meritorious feature of my improved construction a resides, inthe provision of a lpin body having ,expansible vend por-l tions adapted to automatically. accommodate l themselvesto the bearings within which they are mountedV and comprising-endextensions integral with the tubular body .of the pin and complement ary end portions movably seated upon said extensions,Y held thereon ley-means extending through the tubularbody. of thel pin which exerts tension, o n saidmovable end portions causing them totravel over the end extensions ot the pin bodyl tov increase the diameterof the end bearingportions of character set forth consists in the employment ofa tubular Apin'body having semitubular end extensions provided with inner laces inclined from the end of thev body to ay radial shoulder and independent seinitubular complementary end portions seated on said end extensions of the body and having inclined meeting faces which are held yieldably inwardly toward each other by a spring extending through the body to increase the diameter of the end bearing portions Q the pini y y J. I-IAni-iisv a Ik yThe above objects andadvantages ytogether with others of meritA and importance will more fully appear from the following speci` lication, appended claims andaccompanying drawing, in which v Figure ly is a verticalwsectional view:v through-.i piston and connecting rod pre1 bearing portion of my improvedpin. l

Fig. 5 isa perspective Aof the 'bodyy portion of my improved pin.

Fig. 6 is a `longitudinal sectional "view: through my improved` pin showinga modiF lied type ot' spring.

An important use .fOlkllY mPOVed type of `pin vis in piston pins and I havehere shown my improvementl` as embodied-.in a

mounted within bearings `ltol a piston16;v

In practice wear naturally, occurs at H.the

bearing points and more or less looseness and play is developed in operation which produc-es a wobble of thepistonand. unsatf;

isiactory lw'orlring conditions.` Thisjsitual tion becomes more troublesome `astimegoesv on and the practice of replacing pistonpins is a common and wide-spread one. l,

I intend to provide a piston pin oi simple construction and the minimum ynumber of parts adapted to automatically take upfor wear at its bearing ends and of a character easily handled in thatthe entire pin forms a.v n

unitary assembly. My improved yieldably toward each other to increasethe diameter of the end bearing portions of the pin comprises v va tubular body portionlS, the ends ofwhich have been cut awayfto provide integral semi-` pin and by suitable means extending through the tubular body of the pin.

I have shown in Figs. 1 and 2 a coil spring 30 extending through the tubular body of the pin and having its ends connected to the end portions 26, holding them under yieldable tension toward each other to expand the pin at the ends. I have shown each end portion 26 provided with an inwardly projecting lug or radial wall 32 perforated at 34 to permit engagement of the end 36 of the spring therewith.

In Fig. 6 I have shown a modified form of construction in which a flat spring 38 is provided with turned-up ends 40 which engage the radial walls 32 of the movable end portions 2G to hold .such movable end portions toward each other in the saine manner as it is shown in Figs. 1 and 2. The normal unsprung position of this spring is shown in dotted outline in Fig. 6.

The springs 3() or 38 hold the detachable movable end bearing portions 26 normally upon their seats on the end extensions of the pin body so that the entire pin assembly may be handled as a unit in merchandising the article or in assembling it, and the inclined meeting faces are at such an angle to the axis of the pin that the movable end poi'- tions retain any position to which they have been moved upon the end extensions of the pin body under a radial pressure exerted thereon by the bearing within which the pin is mounted.

IVliat I claim is:

1. In a pin having radially expaiisible end portions, a tubular body having semi-tubular end extensions provided with inner faces inclined to the axis of the body, complementary semi-tubular end parts provided with inclined meeting faces and being inovably disposed on said end extensions, and a spring extending through the tubular body connecting said inovably disposed end parts holding them in place on the end extensions under constraint to travel over the inclined faces of the extensions to increase the diameter of the end portions of the pin.

2. In a pin having radially expaiisible end portions, a cylindrical body having end extensions, a complementary end part inovably disposed on each end extension, said extensions and movable end parts having inclined meeting faces whereby longitudinal travel of a movable partover an end extension in a given direction increases the diameter of the end portion of the pin, and means exerting constant tension on said movable end parts to produce such movement.

3. In a pin having radially expansible end portions, a tubular body having end cxtensions, complementary end parts one movably mounted on each end extension of the body, said extensions and movable end parts having inclined meeting faces whereby longitudinal travel of a movable part over an end extension in a given direction increases the combined diameter of the end portion of the pin, and a spring extending tlirongli the tubular body connecting said movable end parts holding them in plat-e on the end extensions yieldably toward each other to travel over the inclined faces of the extensions to increase the diameter of each end portion of the pin 4. A pin of the class described, comprising a tubular body having semi-tubular end extensions provided with inner faces cach inclined from an end of the pin to a radial shoulder, a complementary semi-tubular end part having an inclined meeting face movably seated on each end extension to travel longitudinally thereover increasing the diameter of the end portion of the pin, and a spring extending through the tubular body of the pin engaging said movable end parts exerting constraint thereon to hold them yieldably against the inclined face of the end extensions toincrease the diameter of the end portions of the pin.

5. A pin of the class described, comprising a tubular body having semi-tubular end extensions provided with inner faces inclined from the axis of the body, a coinplementary seini-tubular end part having an inclined meeting face seated on each end extension and movable longitudinally thereover to increase the diameter of the end portion of the pin, each complementary semitubular end part provided with an internally projecting lug, and a spring extending through the tubular body engaging said lugs exerting yieldable tension on said movable end parts to cause them to travel over said end extensions to increase the diameter of the end portions of the pin.

In testimony whereof, I sign this specification.

VERNON J. HARRIS. 

